#include <stdio.h>
#define N 10
int main(int argc, char *argv[])
{
    int a[N]={50,64,2,31,0,5,41,42,7,32};
    int i = 0;
    double count = 0;
    for(i = 0; i < N; i++) {
        count += a[i];
    }
    printf("%.2lf\n", count / N);
    return 0;
}
